Claiming "pro-police forces WANT mayhem" paints the situation in a very generalized, unhelpful, us-versus-them light.
There are definitely some pro-police forces that probably want some mayhem, for exactly the reason you state. There's probably others that want mayhem for other reasons. Across the board, however, I'd imagine most pro-police groups of people prefer peaceful protests that don't put officer lives at risk, not to mention all the collateral damage to protestors, buildings, economies, etc. that also could be avoided.
It's entirely possible (and, I'd argue, likely) that pro-police people aren't some homogenous group of schemers. You can be enraged about police brutality, abuse, and misconduct -- and also enraged by violent riots.
This is the US; you only get to pick one of those.
I am not in favor of rioting/looting but historically, it has been proven effective in some cases to get changes made.
They're either murderous or have "lucky" bad aim.
Exceptions apply for swat snipers in hostage situation
Which is the whole point of the protests. If an officer is on a riot line and is murderous but the other officers on the line don't take them out (send them home or prosecute them), then the officers are just selectively enforcing the law (which I realize is a concept in US law enforcement) to the point of being corrupt.
There were 150 riots in the USA between 1965 and 1968, when LBJ was gathering the votes for civil rights.
The Selma march involved police using attack dogs and water cannons are peaceful marchers. It's damned amazing that (perfectly justifiable) violence against police didn't break out. The tools police use now would (and do) make it far more damaging.
I know several people personally who say this exact phrase, yet they mocked the football players who took a knee during the national anthem at games protesting exactly this issue.
Obviously most sane people would prefer an effective and peaceful protest, but there has yet to be one for this particular issue. So I am hardly surprised it has become this violent, especially with members of the police force and the president antagonizing people further. Also, I would add that any protest of great size naturally has people who try to take advantage of it and turn to anarchy. Shutting down such rioters with force seems to exacerbate the issue, as police force is what is being protest—an understandably difficult predicament.
Nelson Mandela was literally a marxist terrorist, yet is often held up as some kind of ideal of non violent protest.